The fitness tracker that charges itself
Ships in August 2026
Powered by light
No charger.
Ever.
Ray drinks light. A walk to the coffee shop tops it off. A sunny window keeps it running. One minute of real sunlight a day is enough — forever.
If you go a month without seeing the sun, it'll still be running when you come back.
Disappears
You'll forget
it's there.
The thinnest and lightest tracker in the world. Ray slides under a shirt cuff or a watch and stays out of the way of your day. Most people stop noticing it within an hour.
Knows you
Sleep, recovery,
heart, breath.
HRV, heart rate, body temperature, sleep stages, steps, and light exposure — tracked continuously, all night, all day. Trends arrive in your morning notification. No tapping, no syncing, no thinking.
From the first 100 users
"You created a product that aligns with going outside. The most primitive activity of man."
"Your hardware passes the invisibility test."
"I went out for one evening and it literally super-charged."
"This band is so light. I forgot I was wearing it!"
"Now I'm motivated to have a proper sleep schedule."
"I can cross my arms and I don't notice I'm wearing it."
Reserve your Ray.
Batch 2 · ships in August
One-time · no subscription
Your order locks in the founder price, reserves a unit, and unlocks the early-batch perks below. Refundable any time before it ships.
Ships
August 2026
Refunds
Any time before shipping
Ownership
No subscription
Warranty
Lifetime repair or replace
"Your hardware passes the invisibility test."
- Free shipping — forever, on every order
- Lifetime app updates — no subscription, ever
- Lifetime warranty — we'll repair or replace
- Founder's note — first 1,000 orders only
- Refundable any time before shipping
- Secure checkout — handled by Stripe
- Designed and assembled in America 🇺🇸
The math
The wearable, reconsidered.
Everything most trackers do — without the charger, the subscription, or the bulk.
| Metric | Ray | Whoop | Apple Watch | Oura |
|---|---|---|---|---|
| Charging | Sunlight | Every 4 days | Daily | Every 4–7 days |
| Subscription | $0 | $30 / mo | Optional | $6 / mo |
| Weight | 7 g | ~27 g | ~38 g | ~5 g |
| Designed to last | 10+ years | ~2 years | ~3 years | ~3 years |
| 5-year cost | $199 | $1,800 | $800+ | $660 |
| Looks like | Jewelry | A fitness band | A computer | A ring |
Competitor pricing and weights from public specs, 2026. Apple Watch 5-year cost assumes one mid-cycle replacement.
Frequently Asked Questions
Ray tracks heart rate, heart rate variability (HRV), sleep stages, body temperature, steps, and light exposure. All data syncs to our companion app where you can view trends and insights.
Yes, the Ray is fully waterproof and can be worn while swimming, showering, spelunking, running, water poloing, or in any weather conditions.
Pretty much. The Ray charges itself with light, indoors and out — one minute of sunlight a day is enough to run forever. Even in total darkness, it lasts two months on a full charge.
Absolutely, preorders are fully refundable at any time before shipping, no questions asked. Just email us at hello@getchargerless.com.
Batch 2 is reserving now and ships in August 2026. We'll send updates as we get closer to the ship date.
Why we built it
Trackers were supposed to make you fit. Now you take care of them.
“A few years ago I overheard someone on the train say they skipped their morning run because their Apple Watch was dead. That's when it clicked — these devices have gone too far. They were supposed to make us fit. Instead they became one more thing to babysit.”
Ray is what a tracker should be: small, beautiful, self-powering, and yours forever.
Andy Kong
Founder, Chargerless
MIT · ex-Google